Visible light-sensitized photocatalyst immobilized on beads by CVD in a fluidizing bed

In this work, chemical vapor deposition in a fluidized bed was employed for the immobilization of a photocatalyst on beads. By introducing carbon (TiOC), nitrogen (TiON) and iron (Fe/TiO2) into TiO2 matrix, samples were prepared, respectively. The X-ray diffractometer pattern of TiOC revealed a mixture of the anatase and rutile crystalline forms (65% and 34%, respectively) at the reaction temperature of 600 °C. TiOC absorbed in the visible region and showed photocatalytic activity in terms of isopropyl alcohol (IPA) degradation under a fluorescent lamp and blue light-emitting diode. TiON exhibited a shoulder in the absorption near 520 nm and was photocatalytically active under visible light at 460 nm. In the case of the Fe/TiO2 species, lowering the bubbler temperature, i.e. reducing the amount of doped-iron, caused the rate of CO2 evolution to increase during IPA degradation. Among studied species, Fe/TiO2 under the condition of the bubbler temperature at 109 °C with a flow rate of 10 cm3/min showed highest photocatalytic activity in IPA degradation.